Saute snow peas, mushrooms, onoins, and water chestnuts in sesame oil. Stir in bean sprouts. Mix tamari into tofu and blend well. Add it and quarter pound mashed tofu, flour, nutritional yeast and baking powder. Mix well and form into patties 10 cm in diameter. Oil baking sheet with olive oil and bake in preheated 160ºC oven 30 minutes. Flip patties over and bake another 15 minutes. Serve with Mushroom Gravy. MUSHROOM GRAVY: (Soak 5 or 6 shiitake mushroom caps in water beforehand.) Combine water in which mushrooms have been soaked and remaining ingredients and cook on low heat until thickened. "The Associated Press"